On this day: August 1

2007: The I-35W Mississippi River bridge spanning the Mississippi River in Minneapolis, Minnesota, collapses during the evening rush hour, killing 13 people and injuring 145. The NTSB later cited a design flaw as the likely cause of the collapse, and asserted that additional weight on the bridge at the time of the collapse contributed to the catastrophic failure.

Oxygen is discovered, Adolf Hitler presides over the opening of the Olympics, a new superhero is introduced, tragedy strikes the University of Texas, and a new all-music TV network debuts, all on this day.

Hillary Clinton's office said "nothing nefarious was at play" when the former secretary of state used her personal email address, rather than one provided by the State Department, during her four years as America's top diplomat.